Improvement in bolts for middlings-purifiers



UNITED STATES PATENT CFEICE.

JOSEPH V. IVILSON, OF lVARSAlV, ILLINOIS.

IMPROVEMENT IN BOLTS FOR MlDDLlNGS-PURIFIERS.

Specification forming part of Letters Patent No. 152,312, dated June 23, 1874; application iled May 9, 1874.

To all whom it may concern:

Be it known that I, JOSEPH W. WILSON, of Warsaw, in the county of Hancock and State ot' Illinois, have invented a new and useful Improvement in Bolt or Screen for Middlings- Purifiers, ot which the following is a specification: v

Figure l is a longitudinal section of my improved bolt or screen. Fig. 2 is a top view of the outer or larger frame. Fig. 3 is an underside view of the inner or smaller frame.

Similar letters of reference indicate correspondin g parts.

My invention has for its object to furnish an improved bolt or screen for the class of midf dlings-pnrifers that use a iat screen, and which shall be so constructed as to keep the screen-cloth clean, and the middlings thoroughly agitated, increasing the capacity of the bolt or screen, and enabling a much tine-r screen-cloth to be used. The invention consists in the combination of the outer frame, provided with the rollers and one or both the set-screws, with the inner frame, to which the bolt-cloth is attached, provided with the corrugated plates, as hereinafter fully described.

A is a frame of suitable size, and which is placed upon or hung by springs, and vibrated or reciprocated by a crank or eccentric in the usual way. B is a frame placed within the frame A, and made of such a width as to tit between the side bars of the frame A. The frame B is made shorter than the frame A, so that it may have a longitudinal movement within said frame. To the lower part of the inner sides ofthe side bars of the frame A are pivoted small horizontal rollers C, upon which the side bars of the frame B rest. In

recesses in the inner sides of the side bars of the frame A are pivoted small vertical rollers D, the sides of which project to bear against the side bars ot' the frame B, to keep the said against.

frame B in line, and prevent it from binding. To the under side of the parts of the side bars of the frame B that rest upon the rollers (l are attached corrugated plates E, which, as the frame B vibrates or reciprocates, give to the said frame B a slight up-and-down movement. F is a set-screw, which passes in through the end bar of the frame A, for the end ot' the frame B to strike against, to limit its movement. To the other end bar of the frame A is attached a set or stop screw, G, for the other end ot' the frame B to strike The screw F should be provided with a lock-nut, to prevent it from being jarred out ot' place by the pounding of the frame B. Screws or plates should be attached to the ends ot the frame B, to strike against the screws F G, to prevent the said frame from being injured by said screws. To the frame B is attached the bolt-cloth and a flange, to keep the iniddlings from passing oftl at its sides and the wrong end. By this construction the slight up anddown movement and the jar of the frame B keep the bolt-cloth clean, and enable a much tiner boltcloth to be used than would otherwise be possible, thus increasing the capacity ot' the bolt, and causing it to do better work.

Having thus described my invention, I claim as new, and desire to secure by Letters Patentrlhe combination ot' the outer frame A, provided with the rollers C D and set-screws F G, one or both, with the traine B, to which the bolt-cloth is attached, provided with the corrugated plates E, substantially as herein shown and described.

JOSEPH IV. VILSON.

l/litliesses:

J. BRErTENsTEIN, XVM. BREITENs'rErN. 

